AKG CK91 High Performance Cardioid Condenser Microphone Instruction Manual

CK91 High Performance Cardioid Condenser Microphone
Instruction Manual

CK91 High Performance Cardioid Condenser Microphone

CK91, CK92, CK93,
CK94, CK98

Introduction:

The C 390 System is a completely modular system which can be adapted in a very practical and economical way to the always changing requirements encountered in the Recording, Broadcast, Sound Reinforcement, and Motion Picture Industries. The sound engineer has a choice of interchangeable condenser microphone modules which can be mixed and mated in various combinations to create custom studio – quality microphones for any conceivable application.

Description:

The C 390 System consists of a single universal powering/ output module, eight different microphone heads and variqus interchangeable accessory parts to match a great variety of applications. An overview of the complete system is shown at the end of this instruction booklet. The following main features are provided:

• robust mechanical construction
• low self-noise
• low power consumption
• high operating reliability
• fow impedance capsule connections
• will operate up-to 60° C and over 95% relative humidity
• built-in attenuation switch with 0 and — 10 dB position (see fig. 1}
• extended long-life stability
• transformeriess output stage
• to be powered from any standard phantom powering source (acc. to DIN 45596)
•  low distortion even at high sound pressure levels
• built-in bass-cut filter with onset at 100 Hz (see fig. 1)

The microphone features extremely low handling noise due to the low-mass diaphragm and smooth body finish, low r.f. interference due to screening- and filtering technique, and will work under almost any condition due to the conservative and reliable design.
The switchable attenuation of the output level by 10 dB is especially useful in connection with high sound pressure levels (when used in close proximity to high-energy sound sources) and using input stages of amplifiers or mixing desks with limited input level capabilities. Otherwise, this associated equipment will overload before the maximum overload point of the microphone has been reached.
The incorporated bass-cut filter reduces the risk of distortion at low frequencies. This feature is especially useful in combating wind noise or stage floor vibration. The slope of the bass-cut filter is about 12 dB/octave with the cut-off point at about 75 Hz.

Changing Modules:

All capsules may be attached to the powering module via a bayonet connection. Consequently, a quick, safe, and easy change of modules even in dark rooms may be made.
The capsules or accessory modules fit to the powering module in only one position. Once the two parts are put together only a short right-hand twist is required until the modu! ‘‘clicks”’ into position (see figs. 2a, 2b).
The capsule modules may be taken off from the powering module with a left-hand twist.

Applications:

The offered modules and the accessories of the system provide the user with the flexibility to work in a wide range of application areas. We can only list a limited selection because of space.
A) Selection of capsule modules to adjust to ditterent acoustical situations:
CK 91 — Cardioid Microphone Capsule
A classic cardioid capsule suitable for all general purposes where a uniform front-to-back ratio is required.
CK 92 — Omnidirectional Microphone
Capsule This capsule is very suitable for chorus and soloist work in sound and tv studios. Reporters may also benefit from the inherent lack of proximity effect.
CK 93 — Hypercardioid Microphone Capsule
The design and construction is quite similar to the hypercardioid polar response. The resulting higher directivity offers the advantage of better separation in multi-channel recording work or improved gain before feedback in sound seinforcement situations.
CK 94 — Figure-eight Microphone Capsule
This capsule provides for high rejection of sound from the side (90° off-axis) and is consequently well suited for interviews and dramas. In connection with a second microphone with cardioid, hypercardioid, or omni-directional response, an M/S combination can be easily formed and used.
CK 97-0 — Miniature Omni- directional Capsule
A versatile miniature microphone of small dimensions with omni-directional response. Tne capsule may be used generally for voice  applications, but may also be used to record music instruments.
CK 97-C — Miniature Cardioid Microphone Capsule
This miniature microphone may be used wherever a microphone should not be seen in the recording scene. It has a uniform cardioid response and will “provide recordings without excessive portion of reverberation. It will also provide for additional gain
before feedback in sound reinforcement situations.
CK 98 — Short Shotgun Microphone Capsule
This capsule presents a good compromise between required length of the tube and the resulting directivity. The result will justify the operation of this microphone capsule in quite different application areas such as film, tv, stage, and video work. It will also work well where high acoustical! separation between different instruments is required without having to erect acoustical dividers.
Enclosed Accessories:
W 90 foam- type windscreen (with CK 91, CK 92, CK 93, and CK 94)
W 98 foam- type windscreen (with CK 98)

Optional Accessories:

For optional accessories, refer to the current AKG catalog or folder, or visit www.akg.com.
Your dealer will be glad to help.

Powering Technique:

The powering/output module may be powered in phantom power technique according to DIN 45596.
These standards specify a positive voltage on the audio lines versus the screen of the audio cable of 12, 24 and 48 volts.
The following wiring methods are suggested:

1. Circuitry incorporating an input transformer with centre tap (ungrounded)
2. Circuitry incorporating an input transformer without centre tap (ungrounded)
3. In case where single ended (grounded) amplifier inputs, or where no input transformers are available, either capacitors of optional transformers have to be wired into the audio lines to prevent any current leakage into the input Circuitry. The components in the last figure may be easily and economically added to most existing input circuitries and would save the operation of external powering elements.

The following values for Rv (or 2 x Rv) are standardized:

Please note: The resistors 2 x Rv have to be at least of the 0.5% tolerance type to satisfy the symmetry requirements.
Cleaning Hints:
All surfaces may be safely cleaned from time to time with methylated spirit or alcohol. The foam windscreen should be occasionally soaked in a non- aggressive detergent/water solution and will be ready for use after drying.

Specifications of the CK 90-capsules:

CK 91:

2000 ohms load imped. and 1% THD
250 Pada142 dB SPL with 10 dB pre-attenuation
Operating temperature range:| – 20° C to +60° C (- 4° F to + 140° F)
Acceptable humidity level:| 99% at +20° C (68° F), 95% at + 60° C ( + 140° F)
Powering*):| 9- 52 volts d.c. acc. to IEC 61938
Current consumption•):| 52 mA
Outer dimensions:| 19 mm 0 x 52 mm (314 0 x 2.0 inch)
Net weight:| approx. 35 9 (1.2 oz.)
Housing material:| brass
Housing finish:| matte-grey

CK 92

2000 ohms load impel, and 1% THE)
250 Paa142 dB SPL with 10 S pre•attenuation
Operating temperature range.| -20° C to +60° C ( – 4° F to + 140° F)
Acceptable humidity level:| 99% at +20° C (68° F).
95% at +60° C (+140° Ft
Powering•:| 9 – 52 volts dz. acc. to IIEC 61938
Current consumption’):| S2 nut
Outer dimensions:| 19 mm 0 x 52 men OM 0 x 2.0 inch)
Net weight:| approx. 35 g 0.2 00
Housing material:| brass
Housing finish:| matte-grey
CK 93:|
---|---
Electrical working principle: Acoustical working principle:| condenser microphone. self- polarized pressure gradient receiver
Frequency range:| 20 – 20.000 Hz 2 dB Iron nominal frequency curve
Open-circuit sensitivity (at 1000 Hz) •):| 10 inV/Paa – 40 dBV re 1 V/Pa
Electrical Impedance•:| 5200 ohms
Recommended load impedance):| 21000 ohms
Weighted sound pressure level acc. to IEC 60268-4 1:| 26 da
Weighted sound pressure level acc. to IEC 60268- (A.weghtec)1:| 17 dB-A
SIN ratio in ref to 1 Pa (A-weighted).):| 77 dB
Max. sound pressure lever):| 80 Paa132 dB SPL at 1000 Hz,
2000 ohms load imped. and 1% THD
250 Pada.142 dB SPL with 10 013 pre•altenuallon
Operating temperature range:| – 20° C to +60° C ( -4° F to + 140° F)
Acceptable humidly level:| 99% at +20° C (68° F). 95% at + 60° C ( + 140° 9
Pcwering•:| 9- 52 volts d.c. acc. to !EC 61938
Current consumUtiOn• .| S2 mA
Outer dimensions:| 19 mm 0 x 52 mm (314 0 x 2.0 inch)
Net weight:| approx. 35 g (12 oz.)
Housing material:| brass
Housing finish:| matte-grey
CK 94:|
---|---
Electrical working principle:| condenser microphone. self-polarized
_Acoustical working principle: Frequency range:| pressure gradient receiver-
20- 20.000 Hz 2 dB from nominal frequency curve
Open- circuit sensitivity (at 1000 Hz)’):| 10 mV/Pani – 40 dB)/ to 1 VI Pa
Electrical Impedanc•):| 5200 ohms
Recommended load impedance•):| 21000 OhrnS
Weighted sound pressure level ace. to IEC 60268-4 1:| 34 rig
Weighted sound pressure level acc. to IEC60268-4 (A-weighted)•):| 22 53-A
SIN ratio in ref. to 1 Pa (A-weighted)•): Max. sound pressure leve•):| 72 dB
80 PaS132 d8 SPL at 1000 Hz.
2000 ohms load imped. and 1% THD
250 Paa142 ce SPL with 10 53 pre • attenuation
Operating temperature range: Acceptable humidity level:| – 20° C to +60° C ( – 4° F to + 140° F)
99% at +20° C (68° F).
95% at +60° C (+ 140• F)
Powering•):| 9- 52 Wilts d.c. acc. to IEC 61938
Current consumptionl:|   52 mA
Outer dimensions:| 19 mm 0 x 58 mm (3/4 0 x 2.3 inch)
Net weight :| approx. 40 g (1.5 oz.)
Housing material| brass
Housing finish| matte-grey
DK 98:|
---|---
Electrical working principle:| condenser microphone. sell • polarized
Acoustical working principle:| combined pressure gradient and interference tube
Frequency range:| 20 – 20.000 Hz ±2 dB from nominal frequency curve
Open •circuit sensitivity (at 1000 Hz) •):| 20 mV/Paa• – 34 dBV re 1 V/Pa
Electrical Impedanc•):| 5200 ohms
Recommended load impedanc•):| 21000 ohms
Weighted sound pressure level acc to| 30 dB
IEC 60268-4′):
Weighted sound pressure level acc. to IEC 60268-4 (A•weighted)•)| 17 dB-A
SIN ratio in ref. to 1 Pa (A•weighted)•):| 77 dB
Max. sound pressure leve•):| 30 Prou124 dB SPL at 1000 Hz, 2000 ohms load imped. and 1% THD 100 Paib134 dB SPL
Operating temperature range:| -20° C to +60° C (-4• F to + 140° F)
Acceplable humidity level:| 99% at +20• C (+68• 9 95% at +60° C (+ 140° F)
|
Powering1.
Current consumplion•| 9- 52 volts d.c. acc. to IEC 61938 52 mA
Outer dimensions:| 19 mm 0 x 260 mm (314 0 x 10.2 Inch)
Net weight –| approx 80 g (2.8 oz.)
Housing material: Housing finish:| brass/aluminum alloy matte • grey
•1 AP these scieciallv marked scecifications are measured with the ocevennoloulnuf Module SE 300 El

This product conforms to the standards listed in the Declaration of Conformity. To order a free copy of the Declaration of Conformity, visit http://www.akg.com or contact sales@akg.com.Mikrofone
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AKG Acoustics GmbH
**Laxenburger Straße 254, A-1230 Vienna/AUSTRIA, phone: (+43-1) 86654-0*
e-mail:sales@akg.com
For other products and distributors worldwide visitwww.akg.com

A Harman International Company
Technische Änderungen vorbehalten. Specifications subject to change without notice.
Printed in Hungary
06/16/5076370_A**

Documents / Resources

| AKG CK91 High Performance Cardioid Condenser Microphone [pdf] Instruction Manual
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